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R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
B
M10
M8
M6
M12
A
TIMER CONTACTS
A
M11
M9
M7
B
A—INSIDE CONTACTS
B—OUTSIDE CONTACTS
1
MANY PROGRAMMERS HAVE ONLY 8 OR 10 SETS OF CONTACTS.
Fig. 17. Location of timer contacts (front view).
TESTING AND MAINTENANCE
Periodic tests of all boiler controls and safety devices are
required to determine that they are operating as designed to
provide a measure of safety. Because the operation of all
control and safety devices depends on the ability to respond
quickly to activating impulses, perform systematic and
thorough inspection and maintenance on a scheduled basis to
insure the devices are operating as designed at all times. All
information needed to comply with this schedule is be provided
by the boiler and burner manufacturer in the Operating and
Maintenance Instructions furnished with the unit.
It is strongly recommended that the owner or user of the
automatic boiler system set up a formal system of periodic
preventive maintenance and testing. These tests should be
conducted on a regular basis and the results recorded in a
log book. Table 6 contains a recommended check list.
Because of the variety of equipment in use, owners and users
should write a detailed check list for the operator's use. This
list must be in accordance with the equipment manufacturer's
instructions on maintenance and should at least meet the
requirements of the following schedule.
— During initial operation of a system inspection, adjustment,
cleaning, and testing should be performed more frequently.
— Any defects in the system must be corrected immediately.
— Precautions must be taken while testing is in progress to
protect the testing personnel, building occupants, and
equipment from injury or damage.
— It is essential that any personnel who make inspections be
thoroughly familiar with the operating procedures and
equipment functions and be capable of judging when
equipment is operating in accordance with the
manufacturer's instructions and complies with all
governing codes and ordinances.
60-0770—2
B
M4
M2
A
1
A
M3
M1
M5
MOTOR
B
C8348
Minimum Inspection and Testing Schedule
The following inspection and testing schedule is taken from
the ASME safety code, ASME CSD-1.
CM-102 Minimum Schedule
Daily
a.
For high pressure boiler, test low water fuel
cutoff and alarm.
b.
Check fire for good combustion.
Weekly
a.
Check igniter.
b.
Check flame failure detection system.
c.
For low pressure steam boilers, test low water
fuel cutoff and alarm.
Monthly
a.
Test all fan and air pressure interlocks.
b.
Check main burner safety shutoff valve(s) for
leakage.
c.
Check Low Fire Start switch.
d.
For oil: test fuel pressure and temperature
interlocks.
e.
For gas: test high and low fuel pressure switches.
Semiannually
a.
Inspect burner components
b.
Check flame failure system components such as
vacuum tubes, amplifier, and relays.
c.
Check piping and wiring of all interlocks and
shutoff valves.
d.
Recalibrate all indicating and recording gauges.
Annually
a.
Replace vacuum tubes, scanner, or flame rods in
the flame failure system in accordance with
manufacturer's instructions.
b.
Check all coils and diaphragms; test other
operating parts of all safety shutoff and control
valves.
c.
Conduct a pilot turndown test as shown in Table 6.
As required
a.
Test safety valves in accordance with ASME
Boiler and Pressure Vessel Code, Section VI; see
bottom of Table 6.
b.
Recondition low water fuel cutoff.
As required for oil firing
a.
Remove and clean atomizers.
b.
Clean oil strainers
As required for gas firing
a.
Check drip leg and gas strainer.
Cm-103 General
The above instructions are for general guidance. In all cases,
the manufacturer's detailed instructions must be followed.
Table 6. Periodic Testing Recommended Check List (See
Manufacturer's Instructions)
28
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